const splitButIterate = ( li ) => { // [1,2,3,4,5,6,7,8]
  if ( li.length < 2 ) return li;
  const midIdx = li.length / 2;
  splitButIterate( li.slice( 0, midIdx ) ); // 1,2,3,4 
  splitButIterate( li.slice( midIdx ) ); // 5,6,7,8  
  li.forEach( ele => {
    console.log( ele )
  } )
};
